. >> david cherry has resigned on friday after an fbi investigation into e-mail security that has uncovered evidence of an extramarital affair between here and his biographer, paula broadwell. next, we air a book edited by paula broadwell. it reflects his military career and the wars in iraq and afghanistan. for about an hour at politics & prose in washington dc. >> evening, i am bradley graham, co-owner of politics & prose with my wife melissa. on behalf of the entire staff, i would like to welcome me you here. before turning to our guest author, i would just like to say a word about an important event coming up this april. it is being called world book night and it is an ambitious attempt to hand out 1 million free books around the united states. you can read about how this amazing effort is being organized, and sign up to get involved yourself at us.worldbooknight.org. the deadline is tonight, but there is still time after this event. now, a word about our guest this evening, paula broadwell. also, vernon loeb. and the new book, "all in: the education of david petraeus." paula was given